Collapsible drum



July 5K, 1927.

AF. D. VMAISON COLLAPSIBLE DRUM Filed July v, 1926 3 sheets-Sheet 1 3 ATTORNEY.

-F. D. MASON COLLAPSIBLE\DRUM 3 Sheets-Sheet' 2 Filed July 7, 1926 I A T TORNE Y.

1,634,951 F. D. MASON j COLLAPSIBLE DRUM Filed July v, 1926. 5 sheets-sheet 3 July 5, 1927.

INI/EN TOR. l /PEE c; f, n ATTORNEY.

Patented 5,-`

UNITED `STATES' PATENT OFFICE.;

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coLLArsmLn Daun.

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Thisfinvention relates to collapsible drums .7' for use in the manufacture of tires by the flat band method. Y

The'chief object of the invention is to provide a quick-o erating, collapsing mechanism on dat bang tire-building 'drums for facilitating the removal of -tire casings therefromafter they `have been constructed thereon.

The foregoing and other objectsare bbtained by the construction illustrated inthe accom anying drawings l low. t is to be understood that the invention is not limited tothe ecilic form thereof 'as shown and describe Of the accompanying drawings, Figure 1 is a side elevation rof a collapsible tire building drum embodying the invention; Figure 2 is a side elevation of the drum when colla sed; and

. Ftlgure 3 1s a section on-line3`3 of Figure 1, e

dotted vlines in their collapsed positions.

Referring to the drawings, 10 indicates 2 5 the shaft of/aflat band tire builder, whichshaft 10 has a chuck 11 secured thereon for supportin the drum sections and .theiroperating'mec anism. One drum section 12 is provided with a web 12* which is removably secured to. chuck or su porting plate 11 by means of bolts 13, 13, owels.14, 14 preferg ably bein section 12 `are sections 15, 15,- the pivots 16, 16 therefor being in lugs 17 17, on the inner periphery ofsection 12 at itsends. The

lnges compriseplates 18, 18 pivoted at 16.

'- and bolted to lugs' 19,19 on the inner peripheries of sections 15 at the endsv thereof adjacent section 112.

Arranged ,to complete thefdrumis a key section' .20 movable inwardly from the drum Y circle to'permit collapsing of sections 15, 15 inwardly therefrom. Section 20, according- 45- ly, has inwardly diverging ends-at 21, 21 and inner periphery of drum section 20 and slidable in bearings 24,' 24 and 25, 25`on chuck 11. Means may be providedto move the section 20 iwardly, a suitable means for and described bel parts, in addition, being shown in used to position, said sectionproperly t ereon. Hinged onto the ends of this urpose including a lever 26 pivoted on chu 11 at 27 and having a linky 28 hingedly connecting to said lever` and to lugs 23 at- 29, 29.

According to the preferred formofthe invention, sections 15 are adapted to collapse automatically upon withdrawal of key section 20 from the drum circle by connecting said section to chuck 11 by means of tensile sprmgs^30, 30, sections 15 having cams 31, 3 1 on theirinner peripheries adjacent section 20 for riding on said section as'it is` moved to its collapsed position (Figure 2).

Secured on lugs 23, 23 of section 20 are latch plates 32, 32 projecting beyond the ends of said section and having slots 33, 33

therein arranged to engage pins 34, 34 se-A cured on the ree ends of sections 15 as the key section 20 is moved .outwardly onto the 20 from the drum-circle, as section 20 moves `is swung downwardly to withdraw section v inwardly under the action of springs 30,

cams 31 riding on the ends of'section-20.

thus urgingkey section 20 upwardly whic by action against cams 31, moves sections 15 outwardly against the action ofsprin 30 and finally, through latch plates 32 an pins The tire casing 35 may then be slipped 'off 'the drum. Lever 26 .is now swung upwardly,

34, locks sections 15in place in the drum circle.

By the actuation of a single means full'hcollapses the drum quickly and effectively. able mounting of the sections 12 and 20 on construction disclosed herein, the

clfick 11 permit use of drums of 'different i sizes with a single. chuck and collapsing mechanism.

' Modifications-f this ctnstmtionmay be loc resorted to withoutdeparting from the spirit of, the -inventionor apndedgclaims,

' at is claimed is:A

in building tires by theliat band method, said construction including a chuck, a drum 4the scopeof the Ama'. v.1l A collapsible drum-construction foruse Y ofthe first lsection,'and a key section movably mounted on the chuck for operation between the free ends of the hinged sections, means on the chuck for moving the key sec- `tion-'radiallyfinwardl and yielding means normally urging the ree ends of the hinged sections inwardly, said hinged sections haying cam surfaces thereon for riding on said key section.

'2. A collapsible drum construction 'for use in building tires by the fiat band method, said construction including a chuck, a drum section removably secured on the chuck, drum sections hinged on the opposite ends of the first section, and a key section movably mounted on the chuck; for operation between the free ends of the hinged sections, means on the chuck for moving the key section radially inwardly, and yielding means normally urginfrthe free ends of the hinged sections inwardly.

3. A collapsible tire building form, including a chuck, a form section rigidly connected thereto, a key section opposite to the first section and movably mounted on the chuck, sections intermediate the first section and the key section and hinged onto the former, means for moving the key section inwardly of the form circle, and yieldin means normally tending to swing the hinge sections inwardly. i 4. A cylindrical drum or use in the manufacture of tires by the Hat bandmethod, comprising a plurality of sections which form a complete cylinder2 one of the sections being stationary, an inwardly projecting web on said section, a shaft centrally of the drum, a supporting plate on the shaft, means to secure the web to the supporting plate, swinging sections hinged to the ends of the stationary section, a key section o osite thereto, the key section` being mova le toward and from the shaft, and means to move the swinging sections upon the withdrawal l of the key section.

5. A cylindrical,

comprising a plurality of sections which form a complete cylinder, one of the sections being stationary, an inwardly rojectin web on said section, a shaft central y of the um, a supporting plate on the shaft means to secure the web to the supportin plate, swinging sections hinged to the en s of the sta'- tionary section, a key section opposite thereto, mechanism mounted on the supporting plate adapted to move the vke section toward and fromA the shaft, an means connecting a swinging section with the sup porting plate and ada ted to ymove the swinging section inwar ly upon the withdrawal of the key section.

G. In a colla sible tire building form, a chuck, a plura ity of form sections hinged together, a movable form section between the ends ot two of said sections, means to move the form section toward and vfrom the center of the form, and yielding means condrum :for use in the manufacture of tires by the flat band method,

nected to one of the hinged sections and adapted to rock the hin ed section as the movable section approac es the center of the form.

7. In a collapsible tire building form, a chuck, a form secured to the'v chuck, said form comprising a plurality of sections, one of which is movable toward and from the center of the form,y a vsecond section which is movable into overlapping relation to the first named section, a spring connected to the secondlsection and acting to move the second section subsequently to the movement of the first named section, and a surface on the second section adapted td contact with the end of the first section.

FREEMAN D. MASON. 

